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x+(x+3)+(x-2)+3(x+3)-1=87
We move all terms to the left:
x+(x+3)+(x-2)+3(x+3)-1-(87)=0
We add all the numbers together, and all the variables
x+(x+3)+(x-2)+3(x+3)-88=0
We multiply parentheses
x+(x+3)+(x-2)+3x+9-88=0
We get rid of parentheses
x+x+x+3x+3-2+9-88=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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